Photo by @dguttenfelder. My horse and I walk down a mountain slope as a fellow rider waits at the top so he won't roll rocks on to us during a backcountry horseback trip for along the boundary with Yellowstone National Park. For more photos from our 24 day journey for @NatGeo, or of the beautiful #horses and #mules we rode, please follow me at @dguttenfelder by natgeo

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